Feeding polyphase-current circuits with monophase current



H. GUTZWILLER.

FEEDING POLYPHASE CURRENT CIRCUITS WITH MONOPHASE CURRENT.

APPLICATION FILED AUG-5, I918.

1,347,457, Patented July 20, 1920.

UNITED STATES PATENT OFFICE.

HERBERT GUTZWILLER, E serioNENWEEi), SWITZERLAND, ASSIGNOR 0E ONE-HALETO riaEoriiiL BUESS, or LIESTAL, SWITZERLAND.

FEEDING ro YPHAsEciIEEENr CIRCUITS WITH MoivorHAsE CURRENT.

134137.457. specificationofmtersmem. PatentetlJuly 20,1920.

Application filed August 5, 1918. Serial no. 248,445.

To all whom dimer concern: three partial phase currents so that a firstBe it known that I, HERBERT GU'rzwiLLER, partial phase current comprisesall. thehalt a citizen of the Swiss Republic, and resident cycles 1 ofthe monophase current, a second oi? bicliiinenwerd, Canton of Soleure,Swit partial phase current all-the half cycles zerland, have iinientednew and useiulTm and a third partial phase current all. the

rovements 'in Feeding Polyphase-Current half cyclesffi of the primarymonophase cur- Circuits with Monopliase Current, of which rent. Thepartial phase current 2 is reprethe 'iollowiiig is a full, el'ear,andexact specisente'd'in Fig. 1 by a strong line. The pei ication. ri'o'dof timefof one cycle of the partial The usual current types in electricpower phase current is three times greater than installations are thedirect current and the that of the monophase current. If, consealternatecurrent. The electric motor'plants quently, the monophase current hasfor ex; are mostly designed tor alternate current ot ample 50 cycles persecond, when using -i() to 50 cycles; The practice has shown three phaseconductors, the number of cy-. that for electric railway service analtercles of the partial phase currents will be of natecurrent of lesscycles (for example 15 50+3 l6t per second. The three partial to 21)cycles) or direct current is preferphase currents'l, 2 and 3 aredisplaced one able. In order to allow the use oft'he power with respectto another for t of cycle of the plants designed for alternate currentof 40 partial phase current and are therefore able to 5!) cycles for thepurpose of electric railto be used. like ordinary three phase curwayservice, it was hitherto necessary to rents to produce rotating fieldsfor the build up great and expensive transformer drive of inductionmotors.

works to convert the alternate current of 40 The dividing of the primarymonophase to 50 cycles into such of a lower number of current intopartial phase currents may be cycles or into direct current. effectedfor example by a rotary current Accordin to the ii'esent invention thedivider such as re )resentcd b Fi e. 2

r: :1 same ()lJjCClL can be obtained by another way and 3.

without any lllilllStOlIllQDWOlkS, Its subject In Fig. 2, R indicates asynchronously is a method for feeding polyphase current running currentdivider or contact ring, to 8-5 circuits with monophase current, whereinwhich the primary monophase current is the successive positive andnegative half supplied from the line system N, by means waves ot theprimary monophase current are of the brush B and from which the partialseparated by a current divider and disphase currents are taken off bymeans of the tributed alternately over the n phase-conbrushes 1, 2 and 3in order to be supplied to du'ctors of the polyphase current circuit, sothe three-phase conductors of the receiving that each of the said aphase-conductors rethree-phase circuit. The development of ceives apartial alternate current which in the contact ring R with thearrangement of the same time has n times less half? waves its brushes isshown by Fig. 3, wherein the than the primary monophase current. finelyhatched parts (4 represent electric The accompanying diagrammaticdrawconductive, the coarsely hatched parts 7) ining serves to illustratethe improved teedsulating material.

ing method. The contact-ring R makes one revolution Figure 1 is thecurve diagram of a split during one cycle of the partial phasecurnioiiophase current; rents, or during three cycles of the primaryFig. 2 shows a rotary current divider monophase-current. It resultstherefrom used in combination with the improved that the drivingsynchronous motor runi eeding method to supply a three-phase inning withthe primary monophase current duction motor; shall have three polepairs.

Fig. 3 is a sectional view of the circuin- The three partial phasecurrents can be ferential development of the said current supplied tothe three phases 1, 2 and 3 of a divider; r rotating current motor M,having the com- Figs. 4 and 5 show the said current dimon center point 0of its windings convider in combination with other apparatus nected tothe back line of the monophase tobe supplied. current system (Fig. 2).The motor runs As shown by Fig. 1, the primary mono then with the threepartial phase currents of phase current can be separated or split into arelative displacement of 4 of cycle with a number of revolutions whichcorresponds to a number of cycles, reduced to of that of the primarymonophase current.

Instead of supplying a rotating current motor M there may also bearranged a three-phase choke coil D (Fig. 4), to the terminals 1, 2, 3of which a three-phase line system N is connected. The choke coil D mayalso be replaced by a three-phase transformer T (Fig. 5), which allowsto convert the three-phase current in the secondary system N to anydesired voltage. In the two last mentioned cases the combinations ofdevices R D and R T serve to convert the primary monophase current intor0- tatingcurrent for any desired use in distributing systems withsimultaneous reduction of the number of cycles to of that of the primarymonophase current.

hat I claim is:

l. The combination with a monophase current feeding circuit, of areceiving circuit having n-phase conductors, where n is odd and acurrent divider interconnecting said circuits and arranged so as toseparate the successive positive and negative half waves of the primarymonophase current and to alternately distribute the same over then-phase comluctors oi the receiving circuit, so that in each of the-n-phase conductors thereof there flows a partial. alternate currentwhich in the same time has n times less half waves than the primarymonophase current, substantially as described.

2. The combination with a. monophase current feeding circuit, of areceiving circuit having n-phase conductors, where n is odd and a rotarycurrent divider interconnecting said circuits and arranged so as todivide the primary monophase current into three partial alternatecurrents having each one third of the cycle number of the primarymonophase current and resulting jointly in a partial three-phasecurrent, substantially as described.

In witness whereof I have hereunto signed my name this 29th day 01''June, 1918, in the presence of two subscribing witnesses.

HERBERT GUTZVVILLER.

Witnesses H. H. DICK, AMAND R-rr'rnn.

